Delete temporary file before using it (to be safe from reuse)
Delete temporary file before using it (to be safe from reuse)

(cherry picked from commit 4960e036072070bf9659b309ae52f6eb34a09ea0)

uroni/urbackup_backend,uroni/urbackup_backend,uroni/urbackup_backend,uroni/urbackup_backend,uroni/urbackup_backend,uroni/urbackup_backend,uroni/urbackup_backend